MAX7389srff

更新时间： 2024-09-19 12:19:59

品牌	Logo	应用领域
美信 - MAXIM		时钟发生器微控制器
页数	文件大小	规格书
11页	295K
描述
Microcontroller Clock Generator with Watchdog

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MAX7389srff 数据手册

19-3897; Rev 1; 2/06

Microcontroller Clock Generator with

Watchdog

General Description

The MAX7389/MAX7390 replace ceramic resonators,

crystals, and supervisory functions for microcontrollers

in 3.3V and 5V applications.

Features

♦ Robust Microcontroller Clock and Supervisor in a

Single Package

♦ Integrated Reset and Watchdog Functions

♦ Pin-Programmable Watchdog Timeout

♦ Speed Select

The MAX7389/MAX7390 provide a clock source, reset,

and watchdog functions. The watchdog timer is pin pro-

grammable and provides watchdog timeout values in

the 16ms to 2048ms range. The MAX7389 provides a

separate watchdog output that is used as a status indi-

cator or to control safety-critical system elements.

♦ +2.7V to +5.5V Operation

♦ Factory-Trimmed Oscillator

♦ Reset Valid Down to 1.1V Supply Voltage

♦ ±1ꢀmꢁ Clock-Output Drive Current

♦ ±±4 Total ꢁccuracy ꢂor -±ꢀ0C to +1250C

♦ ±2.754 Total ꢁccuracy ꢂor ꢀ0C to +ꢃ50C

♦ 5.5mꢁ Operating Current (12MHz Version)

♦ -±ꢀ0C to +1250C Temperature Range

♦ ꢃ-Pin µMꢁX Surꢂace-Mount Package

♦ 1MHz to 16MHz Factory Preset Frequency

The MAX7390 features a clock-speed select that

reduces the output frequency by half. This functionality

allows the microcontroller to operate at reduced power

and may be used to extend the time available to per-

form housekeeping tasks, such as writing data to flash

during a power failure.

The MAX7389/MAX7390 clock outputs are factory pro-

grammed to a frequency in the 1MHz to 16MHz range.

Four standard frequencies are available. Other frequen-

cies are available upon request. The maximum operating

supply current is 5.5mA with a clock frequency of 12MHz.

Ordering Information

Unlike typical crystal and ceramic resonator oscillator

circuits, the MAX7389/MAX7390 are resistant to EMI

and vibration, and operate reliably at high tempera-

tures. The high-output drive current and absence of

high-impedance nodes make the oscillator invulnerable

to dirty or humid operating conditions.

PIN-

PꢁCKꢁGE

PKG

CODE

PꢁRT

TEMP RꢁNGE

MꢁX73ꢃ9srff

MꢁX739ꢀsrff

-40^oC to +125^oC

8 µMAX

U8-1

The MAX7389/MAX7390 are available in an 8-pin µMAX^®

package. The MAX7389/MAX7390 standard operating

temperature range is from -40°C to +125°C.

Note: “s” is a placeholder for the reset output type. Insert the

symbol found in Table 3 in the place of “s.” “r” is a placeholder

for the power-on reset (POR) voltage. Insert the symbol found in

Table 2 in the place of “r.” “ff” is a placeholder for the nominal

output frequency. Insert the symbol found in Table 4 in the

place of “ff.” For example, MAX7389CMTP describes a device

with 4.38V reset level, open-collector RST output, and a clock

output frequency of 8MHz.

Applications

White Goods

Automotive

Handheld Products

Portable Equipment

Typical Application Circuit, Functional Diagram, and Selector

Guide appear at end of data sheet.

Appliances and Controls Microcontroller Systems

µMAX is a registered trademark of Maxim Integrated Products, Inc.

Pin Configurations

TOP VIEW

CLOCK

RST/RST

WDI

RST/RST

WDS1

WDS2

GND

WDS1

WDS2

GND

MAX7389

MAX7390

WDI

WDO

SPEED

µMꢁX

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

12 3 4 5 6 7...11

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MAX738AC/D	MAXIM	获取价格	5V, Step-Down, Current-Mode PWM DC-DC Converters
MAX738ACPA	MAXIM	获取价格	5V, Step-Down, Current-Mode PWM DC-DC Converters
MAX738ACWE	MAXIM	获取价格	5V, Step-Down, Current-Mode PWM DC-DC Converters
MAX738ACWE	ROCHESTER	获取价格	2 A SWITCHING REGULATOR, 160 kHz SWITCHING FREQ-MAX, PDSO16, PLASTIC, SOP-16
MAX738ACWE+	MAXIM	获取价格	Switching Regulator, Current-mode, 2A, 160kHz Switching Freq-Max, CMOS, PDSO16, PLASTIC, S
MAX738ACWE+T	MAXIM	获取价格	Switching Regulator, Current-mode, 2A, 160kHz Switching Freq-Max, CMOS, PDSO16, PLASTIC, S
MAX738ACWE-T	MAXIM	获取价格	Switching Regulator, Current-mode, 2A, 160kHz Switching Freq-Max, CMOS, PDSO16, PLASTIC, S
MAX738AEPA	MAXIM	获取价格	5V, Step-Down, Current-Mode PWM DC-DC Converters

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